Who are Albert Einstein's great great grandchildren?

Answer 1

A good place to start to figure this out would be with a grandchild such as Hans Albert Einstein or Bernhard Caesar Einstein and then check if he or she has children(therefore making them Albert Einstein's grandchildren).

After doing some searching over the internet I found this site: http://discovermagazine.com/2008/mar/lesser-god/article_view?b_start:int=1&-C=

To summarize the bits I read the adopted sibling of Bernhard, Evelyn, found she may really be Albert Einstein's daughter. The rest of the site mentions how Evelyn found out from Bernhard that his wife, Aude, was pregnant and about to have Albert Einstein's first great grandchild. They mentioned various great grandchildren after this who also have connections to the family as nephews, cousins, and other such relationships they wouldn't if Einstein did not marry his cousin. Hope this helped!